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How To Water Your Perennials

8/12/2022

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by Judy Kautz, OSU Extension Master Gardener

In the past few weeks, we have been made aware that we are once again experiencing a dry period in certain parts of our beautiful state. It doesn’t matter where you live or if your garden is in sun or shade — you’ll have to water perennial plants sometimes. Here are a few things to keep in mind so you can give your perennials the water they need to thrive and look great.        
  
In general, perennials need about an inch of water per week to be healthy. That can come from rain or irrigation or a combination of both. Use your rain gauge to determine how much rain has fallen and then subtract that amount from an inch. This will tell you how much you need to supplement each week. In general, many established perennials can get by with less than this, and newly planted ones may need a bit more, especially in hot weather.
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How often should you water perennials?  A quick drink every day just encourages spindly roots. Instead, deep and less frequent watering is best to promote long roots. They’ll grow down into the ground so they stay cooler and absorb moisture and nutrients that are held there. Perennials with an established root system can handle a little drought stress, too.
Picture
Watering deeply and less frequently helps promote long roots.
When should you water perennials?  Early morning is the ideal time of day to water your garden. This allows you to soak the roots and lose little water to evaporation. Also, foliage dries quickly as the sun and temperatures rise, so plants are less prone to fungal diseases that settle in on wet leaves. Watering in the middle of the day is less ideal, especially with sprinklers, because the small droplets often just evaporate in the air and never reach the soil. Also, winds are stronger at that time and can lead to uneven water distribution and waste as it ends up on your sidewalk instead of your plants. If your schedule doesn’t allow you to water in the morning, then late afternoon to early evening is another option. Do it before 6 p.m., though, so leaves have adequate time to dry before nightfall — this will reduce the chance of disease.

Here are some signs you need to water perennials: Noticing wilted plants is usually a good indicator that it’s time to water. However, droopy leaves and stems aren’t necessarily a signal that the plant is drought-stressed. Many perennials wilt in the afternoon, especially on hot, sunny days, but then they’re fine by morning.

The best way to know if your plants need a drink is to check the soil moisture. Use a trowel to dig down about 3 to 4 in., where the roots are, to see if it’s moist or dry. Some perennials, such as ligularia (Ligularia spp. and hybrids), give an obvious sign that they need a drink, by overtly drooping. If this plant wilts and still looks that way in the morning, you’ll know it’s time to water.

Some watering techniques include hand watering, which can be a relaxing chore, especially on a warm summer day. Be sure to aim your hose-end close to the ground, near the base of the plant. This puts water at the roots where it’s needed. It’s a good method for giving extra moisture to newly planted perennials and ones with high water needs, such as astilbe (Astilbe spp. and hybrids).
Picture
Be sure to aim your hose-end close to the ground, near the base of the plant.
Oscillating and impact sprinklers work well for lawns and large perennial borders. They save you time and are easy to set up, but water loss through evaporation is common and flowers can flop with the weight of too much moisture.  Here’s a tip: Set out a rain gauge when you use an overhead sprinkler and watch the time to see how long it takes to fill up to ½ in. Use the minutes to figure out how long to keep the sprinkler going, based on how much water you need to supplement. A timer can help you give just the right amount, without wasting. It can shut off automatically so you don’t have to worry about water running on and on.

Soaker hoses and drip irrigation systems supply water closer to the root zone, and you can leave them in place all season and just hook up a hose when it’s time to water. Cover up soaker hoses with a little mulch so they’re not as visible during the growing season, then drain and put them away for winter storage. Whatever methods and tools you use for watering, keep an eye out for leaks. Repair hoses and replace washers to make sure the water is going where you need it.
Picture
Soaker hoses like this are a super efficient way (and easy) way to water a perennial garden.
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  • Home
  • About
    • Master Gardener Program
    • Video about Cleveland County MG
    • Constitution
    • Memo of Understanding
  • Events
    • Garden Party 2023
    • Garden Party 2022
    • Garden Party 2020
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    • Photo Gallery 2022 >
      • Garden Party 2022
      • Home Tours June 2022
    • Photo Gallery 2019 >
      • State Conference 2019
    • Photo Gallery 2018 >
      • Demo Garden
      • Garden Tours 2018
      • State Conference 2018
    • Photo Gallery 2017 >
      • Regional MG State Conference June 2017
      • Waterwise Class
      • Will Rogers Tour June 1, 2017
  • Member News
    • Demo Garden Training Videos
    • Recorded meetings/seminars 2021
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    • Desk Volunteer Calendar
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    • Newsletters >
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    • MG Powerpoint Presenstations Available
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    • Dishing the Garden Dirt: The CCMGA Blog
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    • Recorded meetings/webinars 2020
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